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[Phate]

Helping a friend out with his POS daily.  Car is a 2000 civic LX sedan, just put a D15 (B7 I believe) into it because he got a good deal on it and the motor was in great shape.  Swapped out sensors and got it running off the OBD2 D16Y7 ECU, no codes anywhere, passed NYS inspection.  Ran like a sewing machine when it was put in, still runs great, but it gradually started burning coolant.  The coolant smoke doesn't come out of the tailpipe in pulses, so it seems like its not a leak on only one cylinder.  It was bad enough to kill an O2 sensor (completely fouled with greenish-white crusty shit).  Plugs are white.

The weirdest thing is that the previous motor that was put into this car, a Y8, ran great (except for a knock) for about 8,000 miles before it started doing the same thing.  The only parts that have been re-used between the two engines are the electrics, header, throttle body, and cooling system.

Only things I can think of would be something in the intake manifold leaking, or he somehow fucked something up to the point where it would completely trash a head gasket across all 4 cylinders (cooling system overpressure?).

[HiProfile]

intake manifold leaking

That's my vote. If you find shit on top of the intake valves, you know it's not from the cylinder head. GSR manifolds are prone to cracking near the t-stat, so it's possible for Honda parts to crack. My guess is the TB is cracked around where the coolant goes through, aka the old FITV spot.

[crttaz]

IACV or FITV leaking, or lines plumbed wrong

[Phate]

I think hes got a spare throttle body, maybe throw that on. It wont idle right, since the spare throttle body uses a different idle air control, and will probably run a CEL, but if we can keep it running long enough to see if its blowing coolant smoke, it could work.

lines plumbed wrong

any fairly obvious ways one could make this happen? I don't put my friend doing stuff wrong outside the realm of possibility. Upper and lower coolant hoses are pretty obvious where they go, doubt that got screwed up. All I can think of is maybe mixing up the drain and feed for the heater core and throttle body.

[crttaz]

small lines on the back of the engine, I've seen them mixed up, coolant was being pumped into the engine, ran like shit until the level was about 1/2 low. If you topped it off it would hydro lock a cylinder then next morning.

One of those "dumb ass" cars that came into a shop I was helping at in 2005. Bent a rod just cranking the motor over.

[Phate]

small lines on the back of the engine, I've seen them mixed up, coolant was being pumped into the engine, ran like shit until the level was about 1/2 low. If you topped it off it would hydro lock a cylinder then next morning.

Sounds like we might have a winner, especially since the problem has followed engines.  The car was purchased with a blown motor partially taken apart (by someone else), so there was no way of seeing the way the hoses should be run.

[HiProfile]

there was no way of seeing the way the hoses should be run.

http://www.helminc.com

http://www.alldata.com/

http://www.hondapartsdeals.com/honda_parts.php (diagrams)

Then there's the age-old "is it wet or dry" test. Wet tubes don't connect to the intake manifold.

[DasPoop]

Just make sure it makes a loop between water pipe fift iacv and back under the no4 runner. I dont think order of components matters.